Altima MOST bus failure

The symptoms you describe strongly suggest a fault within the MOST (Media Oriented Systems Transport) bus network. This network facilitates high-speed data transmission between various control units in your Altima, including the audio amplifier, navigation module, and head unit. A defect in any one of these units can disrupt the entire bus, leading to the problems you're experiencing. To diagnose this accurately, one must systematically isolate each unit on the MOST bus. Do you have access to the diagnostic tools needed to accomplish this?

Thank you for this explanation. While I possess some technical acumen, I am not equipped with the specific diagnostic tools required to delve into the intricacies of the MOST bus. Could you elaborate on the isolation process you mentioned? What steps are involved, and what specific tools would be necessary for a thorough diagnosis?

Given your situation, and the complexity of MOST bus diagnostics, it might be prudent to consult with a qualified technician who possesses the necessary diagnostic equipment and expertise. The isolation process involves using a MOST bus loopback connector to bypass each control unit sequentially. If the audio system returns to normal operation when a specific unit is bypassed, it indicates that the bypassed unit is the source of the fault. However, without the correct tools and knowledge, attempting this yourself could inadvertently cause further damage. Expect a repair cost in the neighborhood of 1000€.

I appreciate your candid assessment and the recommendation to seek professional assistance. It seems the complexity of the MOST bus necessitates expertise beyond my current capabilities. I shall entrust my Altima to a reputable workshop for diagnosis and repair. Thank you again for your invaluable guidance. It ended up costing me 1000€ to fix it.